Carrier scraper



NGV. 10, 1942. 1 w ZAHARA 2,301,604

CARRIER S CRAPER Filed June 24, 1941 2 Sheets-Sheet 1 v f To. JoH/v WZAHAQA ATTORNEYS.

NOV. l0, 1942. J, w, ZAHARA 2,301,604

CARR IER S QRAPER Filed June 24, 1941 2 Sheets-Sheet 2 INVENTOR. JOHN WZAHAEA l "www A TTORNE'YS.

Patented Nov. 10, 1942 UNITED STATES PATENT OFFICE 2,301,604 CARRIERSCRAPER John W. Zahara, San Carlos, Calif.

Application June 24, 1941, Serial No. 399,487,`

13 Claims.

The present invention relates to carrier scrapers of the heavy duty roadgrader type employed in construction work of all kinds wherein movementof earth is desired. More specifically my invention relates to earthmovers utilizing main and auxiliary bowls.

One of the principal objects of the invention is the improvement andsimplification of the means employed to move relatively the main andauxiliary bowls in the loading and dumping' operations.

'I'he invention also relates to improvements in means for insuring thereturn of the main bowl from its discharge to loading position.

Additionally, the invention forming the subject-matter of thisapplication contemplates certain novelties in construction whereby themeans for actuating the auxiliary bowl, or apron as it is termed by somein the art, are so positioned as to reduce wear and tear thereon to aminimum and to thus eiiect certain desirable economies in the operationof the devices.

Other objects and advantages will become apparent as this specicationproceeds and the novelty of the invention will be set forth in theappended claims.

In the drawings forming a part thereof:

Fig. 1 is a side elevation of a carrier scraper embodying my inventionwith the main and auxiliary bowls in a carrying or loaded position,

Fig. 2 is a vertical longitudinal section of the device of Fig. 1 withthe main and auxiliary bowls in discharge position.

Fig. 3 is a vertical longitudinal section of the device of Fig. 1showing the bowls in scraping position,

Fig. 4 is a longitudinal sectional View along the line 4-4 of Fig. 1,and

Fig. 5 is a section along the line 5-5 of Fig. 4.

'Ihe preferred embodiment of my invention il-` lustrated in the drawingsincludes the essential elements of a carrier scraper of a well-knowntype. I'he numeral I0 denotes the side frames Aof the scraper ofconventional trussed beam conspaced cable I4, anchored at the end of theside frame 55 and suitably journaled in the side skirts I9.

as at I5, passing over a sheave I6 disposed on the beams I2 and taken upby a conventional power drum on the tractor by which the scraper isdrawn (not shown). Thus the forward end of the scraper is not onlysupported by the combination of the beam I2 and the cable I4, but

by these means may be raised and lowered between scraping an-d carryingpositions (see Figs. 3 and l, respectively).

Additionally, the scraper includes side plates I8 rigidly secured to theside frames I0 to define the sides of the compartment into which theearth is gathered by the scraper means, which side plates in thisinstance extend below the side frames ID t0 provide a skirt I9. The mainbowl 2D, as usual, is a scoop shaped body, which in the loading vandcarrying operations forms the bottom and back of the earthcompartment,and is connected for pivotal movement at its forward end to a pin 2Iextendingtransversely between A post 22 disposed medially of the back ofthe main bowl 20 extends upwardly therefrom 1n the form of a gooseneck23.

The main bowl 20 is rendered tiltable on its pivot 2I bymeans of itsoperative connection to a pull cable 2'I passing through a plurality ofsheaves 28 and 29, the former being carried at the outer end ofgooseneck 23 and the latter being positioned on a beam 30 spanning apair of posts 3I extending upwardly from the side frames I0 at theforward end of scraper. The posts 3l are braced by the rearwardlydeclining struts connected at their opposite ends to a pair oi' shorterposts 33 extending upwardly from frame I0 midway the sides of thescraper.

As will be noted from Fig. 1 one end of the pull cable 2I is anchored onthe conventional block for sheaves 29. The opposite end extends to asuitable power drum on the tractor (not shown). It will therefore beapparent that pull exerted on cable 21 will tend to shorten the distancebetween sheaves 28 and 29 and thus tilt main bowl 20 on its pivot 2l toeffect discharge of the contents of the scraper, Whereas slacking oi onthe cable 21 will permit bowl 20 to return to its scraping position,such return being aided and insured by certain novel means presently tobe described.

A scraper blade 35 having a rigid support 36 extends transverselybetween the skirts I9 with its cutting edge projecting slightly belowthe edge of the said skirts. If desired the parallel pin 2l may beadditionally journaled on the blade support 36 for additional strengthin the structure.

It will be readily appreciated that the blade may be provided with anadjustable connection to the support 35 to meet varying conditions.

An auxiliary bowl or front apron 40 is supported for relative pivotalmovement with respect to the main bowl by a pair of rigidly connectedrearwardly projecting arms 4|, the ends of which are connected totrunnions 42 in lugs 43 on the posts 33.

The auxiliary bowl 45 is automatically moved from a closed position, inwhich its lowermost edge abuts the blade 35 (see Fig. l) to its fullopen or raised position (see Fig. 2) upon the tilting of the main bowl20. The means for effecting this automatic opening and closing of theauxiliary bowl 4|] include links 44 connected at one end to theauxiliary bowl 45 and having an operative connection with pusher rods 45slidably disposed on the side members of frame ||l and extending throughthe posts 33. Blocks 48 on the rearmost ends of pusher rods 45 carrysheaves 49 through which cable 5l] is passed to provide an operativeconnection whereby pull exerted on the cable 55 will cause the pusherrods 45 to be moved forwardly to urge auxiliary bowl upwardly about itspivots 42 into its opened position. Y

The two ends of cable 50 are anchored, as at 5|, on post 22 on main bowl20, from whence cable 55 extends through sheaves 52 in blocks 53 locatedon the top 'and either end of the cornpression spring housing 54 at therear of the scraper. From sheaves 52 cable 50 extends through sheaves 55in blocks 55 on the side frames l5 adjacent posts 33 and from thenceover sheaves 45 back to sheaves 51 in blocks 53 and into the compressionspring box 54 (see Fig. 4). By multiplying the number of sheaves 49 and51 the speed of movement of auxiliary bowl 4|] may be decreased forheavy duty operations.

Within the housing 54 there are two longitudinally extendingsuperimposed compression springs 55 the function of which, through themedium of operative connections with cable 5U, is to urge the main bowl20 rearwardly from its full open position (see Fig. 2) past its centerof gravity toward its scraping position (see Fig. 3) Opposite ends ofthe springs 55 are anchored to the end walls of the housing 54, as at5|, and their free ends receive keeper pins 52 projecting from sheaveblocks 53. As will be noted from Fig. 4 cable 50 is looped about sheaves54 on blocks 53, passing out of the spring box 54 over sheaves 55 and 65positioned at opposite ends of the housing 54.

Normally blocks 53 are locked against longitudinal movement in thehousing 54, and hence springs 50 are retained against compression, bydogs 51 the tips of which engage the projecting lips 68 on blocks 53.Release of the dogs 51 is effected when blocks 48, under the pull ofcable 55 on sheaves 49, are moved forwardly to strike the triggers 59slidably supported on stops 10 on frame I5. Movement of triggers 59causes rods 1|, with which they are connected, to be drawn forwardlymoving the inclined surfaces 12, at the opposite ends of the rods 1|,under and urging upwardly the wedge pins 13. Wedge pins 13 are slidablyretained by any suitable guide means, such as straps (not shown). Dogs61, normally urged into engagement with blocks 53 by springs 14, arelikewise provided with an inclined surface 15 against which the upwardthrust Vof wedge pins 13 will be transmitted into lateral movement ofthe dogs 51 out of engagement with sheave blocks 63 compressing springs14. When dogs 51 are thus retracted further pull on cable 55, as mainbowl 20 moves toward its dumping position, will draw the sheave blockstoward each other and compress the springs 6D for the purpose abovestated.

While in the preferred form of the invention I have illustrated a wedgetype dog release it will be readily appreciated by those skilled in theart that other means may be substituted with equal eiiicacy. There aremany ways in which triggers 69 and dogs 51 may be linked for conjointmovement.

Operation To set the machine for the loading operation, i. e., scraping,the operator takes up cable 21 on the tractor power drum to raise themain bowl 20 suiiiciently to cause a pull on cable 50. Since both endsof cable 50 are anchored on post 22 this initial movement will drawsheave blocks 48 toward the stops 10 and urge pusher rods 45 forwardlywhich, through the links 4|, will swing auxiliary bowl 4|] about itspivot 42. This movement of auxiliary bowl 45 need be very slight sinceonly a, relatively narrow slot or opening between its bottom edge andblade 35 is necessary to eifectively load the scraper (see Fig. 3). Inpractice the earth passing over blade 35 under the momentum of thevehicle coming from the bottom surges within the compartment to ll bothmain and auxiliary bowls.

When the scraper is fully loaded the operator takes up cable |4 on thepower drum at the tractor to raise the carrier clear ofthe earth line,at the same time slacking oir on cable 21 to permit the weight of theload to lower the main bowl 20 to its carrying position and move theauxiliary bowl 40 into its closed position abutting the Vblade 35 (seeFig. 1).

` In the dumping operation the operator is required to merely take up oncable 21 until the main bowl is raised to its full discharge position(see Fig. 2) as the opening of the auxiliary bowl 4|) is fullyautomatic. As main bowl 20 swings upwardly about its pivot 2| cable 55,anchored on post 22, is drawn over sheaves 52, 55, 49 and 51, causingsheave block 48 and pusher rod 45 to slide forwardly and by means of thelink 44 urge auxiliary bowl 4|) about its pivotal connection 42 to post33 into full discharge position (see. Fig. 2). Blocks 48 at the end oftheir paths oi travel actuate triggers 63 and are checked by stops 10 onthe side frame l0, thus limiting further opening of the auxiliary bowl4|).

Actuation of the triggers 59 draws rods 1|' forwardly to thrust wedgepins 13 upwardly to disengage the dogs 51 and thus release the sheaveblocks 53. Continued movement of the l'main bowl 20 toward fulldischarge position draws on cable 50 which in passing over sheaves 64 inthe spring box 54 compresses the springs 5B. When the load has beendischarged cable 21 is slacked off at the power drum and the tension Vofsprings 5U transmitted through cable 50 rwill pull mainv bowl 20 pastits center of gravity from whence of its own weight it will returntoward its lowermost or loading position. Return of rods 1| andresetting of triggers 59 is effected by any yieldable means such asvsprings 11 connected between the outer ends of the rods 1|) and thevehicle frame. i

It win be apparent to those skilled in the are hereof provision has beenmade for minimizing wear and tear on cables and sheaves and other meansfor actuating the auxiliary bowl by locating `the same away from forwardend of the machine at which earth is contacted.

Additionally, the simplified means for automatically actuating theauxiliary bowl and insuring return of the main bowl to its loadingposition will be found advantageous in that they permit economies incost of construction and maintenance, while at the same time attainingobvious efficiencies in operation.

Having fully shown land described a preferred embodiment of my inventionfor purposes of illustration I desire full protection as to the manypermissible changes therein which may be made within the scope of theappended claims.

The invention claimed is:

1. A carrier scraper of the type wherein oppositely arranged main andauxiliary bowls are supported by a frame for tilting movement relativeto each other from carrying to discharge position comprising means foreffecting tilting of the main bowl, members slidably mounted on saidframe having operative connections with the auxiliary bowl to cause itto be moved from carrying to discharge position, and means actuated bythe main bowl upon tilting thereof to eilect movement of the slidablemembers.

2. A carrier scraper of the type wherein oppositely arranged main andauxiliary bowls are supported by a frame for tilting movement relativeto each other from carrying to discharge position comprising means foreffecting tilting of the main bowl, members slidably mounted on saidframe having operative connections with the auxiliary bowl to cause itto be moved from carrying to discharge position, means actuated by themain bowl upon tilting thereof to effect movement of the slidablemembers, and stop means for the slidable members.

3. A carrier scraper of the type wherein oppositely arranged main andauxiliary bowls are supported by a frame for tilting movement relativeto each other from carrying to discharge position comprising means foreiecting tilting of the main bowl, members slidably mounted on saidframe, supports therefor, means actuated by the main bowl upon tiltingthereof to eiect movement of the slidable members, means connecting theslidable members with the auxiliary bowl `to cause it to be moved fromcarrying to discharge position at a rate greater than that of theconcomitant movement of the main bowl, and stop means for the slidablemembers.

4. A carrier scraper of the type wherein oppositely arranged main andauxiliary bowls are supported by a frame for tilting movement relativeto each other from carrying to discharge position comprising means foreffecting tilting of the main bowl, members slidably mounted on saidframe, links connecting the slidable members and the auxiliary bowl, andmeans actuated by the main bowl upon the tilting thereof to effectmovement of the slidable members.

5. A carrier scraper of the type wherein oppositely arranged main andauxiliary bowls are supported by a frame for tilting movement relativeto each other from carrying to discharge position comprising means foreiecting tilting of the main bowl, members slidably mounted on saidframe, pusher rods xed on the slidable members, links connecting thepusher rods and the auxiliary bowl, and means actuated by the main bowlupon tilting thereof to eiect movement of the slidable members.

' sitely arranged main and auxiliary bowls are supported by a frame fortilting movement relative to each other from carrying `to dischargeposition comprising means for tilting the main bowl, a pair of membersslidably mounted on said frame, means connecting the slidable membersand the auxiliary bowl to effect tilting of the latter upon movement ofthe former, and flexible means having an operative connection with themain bowl and said slidable members to actuate the slidable members uponthe tilting of the main bowl.

8. A carrier scraper of the type wherein oppositely arranged main andauxiliary bowls are supported by a frame for tilting movement relativeto each other from carrying to discharge position comprising means fortilting the main bowl, a pair of members slidably mounted on said frame,means connecting the slidable members and the auxiliary bowl to effecttilting of the latter upon movement of the former, flexible means havingan operative connection with the main bowl and said slidable members toactuate the slidable members upon the tilting of the main bowl, and stopmeans limiting the movement of the slidable members.

9. A carrier scraper of the type wherein oppositely arranged main andauxiliary bowls are supported by a frame for tilting movement relativeto each other from carrying to discharge position comprising means fortilting the main bowl, a pair of members slidably mounted on said frame,means connecting the slidable members and the auxiliary bowl to effecttilting of the latter upon movement of the former, flexible means havingan operative connection with the main bowl and said slidable members toactuate the slidable members upon the tilting of the main bowl andyieldable means releasable upon movement of the slidable members apredetermined distance to urge the main bowl from its tilted positionback toward its carrying position.

10. A carrier scraper of the type wherein oppositely arranged main andauxiliary bowls are supported by a frame for tilting movement relativeto each other from carrying to discharge position comprising means fortilting the main bowl, a pair of memb-ers slidably mounted on saidframe, means connecting the slidable mem-bers and the lauxiliary bowl toeffect tilting of the latter upon movement of the former, flexible meanshaving an operative connection with the main bowl and said slidablemembers to actuate the slidable members upon the tilting of the mainbowl, compressible members having an operative connection with the saidflexible means effective upon compression to urge the main fowl from itstilted position back toward its carrying position, and releasable meansnormally restraining the compressible members.

11. A carrier scraper of the type wherein oppositely arranged main andauxiliary bowls are supported by a frame for ltilting movementrelativeto each other from carrying to discharge position comprising means fortilting the main bowl, a pair of members slidably mounted on said frame,means connecting the slidable members and the auxiliary bowl to effecttilting of the latter upon movementwof the former, flexible means havingan operative connection with the main bowl and said slidable members toactuate the slidable members upon the tilting of the main bowl,compressble members having an operative connection with the saidiiexible means effective upon compression to urge the main bowl from itstilted position back toward its carrying position, releasable meansrestraining the compressible members, and means actuated by the slidablemembers to effect release of the restraining means f-or the compressiblemembers.

l2. A carrier scraper of the type wherein oppositely arranged main andauxiliary bowls are supported by a frame for tilting movement relativeto each other from carrying to discharge position comprising means fortiling the main bowl, a pair of members slidably mounted on said frame,means connecting the slidable members and the auxiliary bowl to effecttilting of the latter upon movement of the former, flexible means havingan operative connection with the main bowl and said slidable members toactuate the slidable members upon the tilting of the main bowl,compressble members having an Ioperative connection with the saidflexible means eiiective upon compression to urge the main lbowl fromits tilted position back toward its carrying position, releasable dogsnormally restraining the compressible members, trigger means in the pathof the slidable members having lan operative connection to release saiddogs.

13. A carrier scraper of the type wherein oppositely arranged main andauxiliary bowls are supported for tilting movement relative to eachother from carrying to discharge position comprising means for tiltingthe main bowl, compressible members having an operative connection withthe main bowly effective upon compression to urge the main bowl' fromits tilted position back toward its carrying position, and releasablemeans restraining the compressi'ble members through the greater portionof the tilting movement of the main bowl from its carrying to dischargeposition.

JOHN W. ZAHARA.

